The utility model relates to a theftproof alarming lamp. The utility model utilizes the detecting function of the ultrasonic Doppler effect to complete the automatic control for illuminating lamps through the processing for signals by an oscillating drive circuit, an ultrasonic transducer, an amplifying circuit, a detection circuit, an optical control circuit, a monostable circuit, a relay, etc. Thus, the lamps are switched on at night when people walk around, and the lamps are switched off when people leave. The utility model is used as an automatic control illuminating lamp in normal times, and sends out light alarm encountered with burglar. Therefore, two functions of illumination and theft prevention are both obtained in one device.